"Aquatica Plus UK ships Fluval CO2 Ceramic Diffuser 88g from Amazon.co.uk. Amazon.co.uk has fast shipping in the UK and often free shipping on pond and aquarium supplies. Add to your basket now while supplies last to avoid delays."

Really fine bubbles which dissolve quickly into the water. Takes a little bit of time for the pressure to build with DIY yeast mix. So just be patient. About 12-18 hours depending on the amount of yeast used.I also have a bell co2 chamber above thus diffuser so that bubbles do not get to the surface and increase water gas interaction. It works well.

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Pond & Aquarium Supplies in the UK